0001 """ Python 'hex_codec' Codec - 2-digit hex content transfer encoding 0002 0003 Unlike most of the other codecs which target Unicode, this codec 0004 will return Python string objects for both encode and decode. 0005 0006 Written by Marc-Andre Lemburg (mal@lemburg.com). 0007 0008 """ 0009 import codecs, binascii 0010 0011 ### Codec APIs 0012 0013 def hex_encode(input,errors='strict'): 0014 0015 """ Encodes the object input and returns a tuple (output 0016 object, length consumed). 0017 0018 errors defines the error handling to apply. It defaults to 0019 'strict' handling which is the only currently supported 0020 error handling for this codec. 0021 0022 """ 0023 assert errors == 'strict' 0024 output = binascii.b2a_hex(input) 0025 return (output, len(input)) 0026 0027 def hex_decode(input,errors='strict'): 0028 0029 """ Decodes the object input and returns a tuple (output 0030 object, length consumed). 0031 0032 input must be an object which provides the bf_getreadbuf 0033 buffer slot. Python strings, buffer objects and memory 0034 mapped files are examples of objects providing this slot. 0035 0036 errors defines the error handling to apply. It defaults to 0037 'strict' handling which is the only currently supported 0038 error handling for this codec. 0039 0040 """ 0041 assert errors == 'strict' 0042 output = binascii.a2b_hex(input) 0043 return (output, len(input)) 0044 0045 class Codec(codecs.Codec): 0046 0047 def encode(self, input,errors='strict'): 0048 return hex_encode(input,errors) 0049 def decode(self, input,errors='strict'): 0050 return hex_decode(input,errors) 0051 0052 class StreamWriter(Codec,codecs.StreamWriter): 0053 pass 0054 0055 class StreamReader(Codec,codecs.StreamReader): 0056 pass 0057 0058 ### encodings module API 0059 0060 def getregentry(): 0061 0062 return (hex_encode,hex_decode,StreamReader,StreamWriter) 0063
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